Palladium-catalyzed enantioselective linear allylic alkylation of vinyl benzoxazinanones: An inner-sphere mechanism
作者:Kai Wang、Binli Wang、Xianghui Liu、Hongjun Fan、Yan Liu、Can Li
DOI:10.1016/s1872-2067(20)63751-2
日期:2021.7
Palladium-catalyzed asymmetric allylic alkylation (AAA) of vinyl benzoxazinanones has become an important strategy for the synthesis of chiral nitrogen-containing heterocycle compounds. However, the asymmetric synthesis of linear-selective products has rarely been reported. The simultaneous control of regio-, E/Z- and enantioselectivities constitutes a major challenge and inhibits the advancement of
乙烯基苯并恶嗪酮的钯催化不对称烯丙基烷基化(AAA)已成为合成手性含氮杂环化合物的重要策略。然而,很少有关于线性选择产物的不对称合成的报道。同时控制区域,E / Z和对映选择性构成了主要挑战,并抑制了该化学反应的发展。在这里,我们提出了乙烯基苯并恶嗪酮与α-硫氰酸根酮的钯催化AAA ,提供了各种具有高线性,E-和立体选择性。该反应具有广泛的底物范围,并且手性硫氰酸酯可以转化为有用的杂环。实验和计算研究表明,AAA过程的内球机理是由于亲核基质与钯催化剂的酸性和配位作用所致。